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High-water-retention sustained-release fertilizer

A technology of slow and controlled release fertilizer and controlled release carrier, applied in the field of chemistry, can solve the problem of no super absorbent resin polymer, etc., and achieve the effects of low cost, high water absorption, and long water retention time

Inactive Publication Date: 2015-02-11
CHONGQING HENGYUAN JINTONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no research report on the use of tobacco stems as superabsorbent resin polymers.

Method used

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  • High-water-retention sustained-release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The water retention slow controlled release carrier of embodiment 1 organic fertilizer

[0031] Treatment of a tobacco stem

[0032] The tobacco stem residue also contains lignin and hemicellulose, and the cellulose accounts for not less than 50% of the total weight of the tobacco stem residue. It can also be made from tobacco waste from other parts.

[0033] The cellulose is preferably low-crystalline modified cellulose. Therefore, it can be modified by sodium hydroxide solution. For details, please refer to the article "Effect of NaOH pretreatment on the enzymatic properties of plant cellulose" and its references.

[0034] For the cellulose extraction method, please refer to the Chinese patent application with application number 201210042673.4.

[0035] or as follows:

[0036] Crush the tobacco stems, add 20 times the weight of water, adjust the pH value to 12, and treat it under a microwave with a power of 100W for not less than 1 minute to obtain a pretreated m...

Embodiment 2

[0038] Example 2 Preparation of water-retaining slow-release carrier of organic fertilizer

[0039] Recipe one:

[0040] Acrylic acid and cellulose in the modified non-crystalline region are grafted to form a polymer. The polymer formed by 8 parts by weight of the precipitate and 60 parts by weight of the acrylic acid has a degree of neutralization of acrylic acid of 70%; Initiator K 2 S 2O 0.2 parts by weight, N, N'-methylenebisacrylamide 4 parts by weight.

[0041] Recipe 2:

[0042] Acrylic acid and modified amorphous region cellulose are formed by grafting to form a polymer. The polymer formed by 12.5 parts by weight of the precipitate and 62 parts by weight of the acrylic acid has a neutralization degree of 90%; Initiator K 2 S 2 0.4 parts by weight of O, 6 parts by weight of N,N'-methylenebisacrylamide.

[0043] Recipe three:

[0044] Acrylamide and cellulose in the modified non-crystalline region are grafted to form a polymer, and the polymer formed by 12.5 part...

Embodiment 3

[0053] Example 3 High water retention slow controlled release fertilizer

[0054] The organic fertilizer is dried and granulated, and then sprayed on the surface of the organic fertilizer granules after being heated to a molten state with the water-retaining slow-controlled release carrier of the five organic fertilizers of the second formula in Example 2. The spraying amount is 5% of the organic fertilizer quality, and after cooling and drying, the obtained The finished product is high water retention slow controlled release organic fertilizer. After testing, it conforms to GB / T 23348-2009. After testing, its sustained release period is 79 days.

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Abstract

The invention belongs to the field of organic chemistry, and relates to preparation of sustained-release organic fertilizers. The organic fertilizer consists of an organic fertilizer body and a water-retention sustained-release carrier, wherein according to the dry weight, the water-retention sustained-release carrier accounts for 2-8 percent of the weight of the organic fertilizer body; the water-retention sustained-release organic fertilizer is a polymer prepared by grafting crylic acid and / or a crylic acid derivative and cellulose-containing tobacco stem slag; and the crylic acid derivative comprises acrylamide or sodium acrylate. The water-retention sustained-release carrier of the organic fertilizer provided by the invention is high in water absorption, long in water retention time, low in cost, environment-friendly and prepared by tobacco waste serving as a raw material; when the water-retention sustained-release carrier is grafted to the crylic acid or the crylic acid derivative thereof to form the polymer, an undesirable water absorption effect is achieved; the organic fertilizer has the advantages of slow release and controlled release and is suitable for fertilization of places which are changeable in climates and are easy to dry.

Description

technical field [0001] The invention belongs to the chemical field and relates to slow-release and controlled-release fertilizers. Background technique [0002] Superabsorbent resin is a kind of polymer functional material, which has large water absorption capacity and strong water retention. It can absorb more water than its own weight, and the absorbed water will not be squeezed out under appropriate pressure. Acrylic acid is a commonly used superabsorbent functional material, and its chemical formula is C 3 h 4 o 2 The organic compound is an unsaturated carboxylic acid consisting of a vinyl group and a carboxyl group. Pure acrylic acid is a clear, colorless liquid with a characteristic pungent odour. It is miscible with water, alcohols, ethers and chloroform and is prepared from propylene obtained from refineries. Cellulose-based superabsorbent resin refers to the polymer formed by grafting cellulose and its derivatives into the water-absorbent resin through polymeri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02C05G3/00
Inventor 陈奎张健荣杨柯何震曾小梅
Owner CHONGQING HENGYUAN JINTONG TECH
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